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Specification, model and size of hexagon wrench
The specifications, models and sizes of Allen wrenches are mainly divided into hexagon and external hexagon.

For an Allen wrench, it mainly depends on the size of the corresponding screw. Common specifications are: 2, 2.5, 3, 4, 5, 6, 7, 8, 10, 12, 14, 17, 19, 22, 24.

For external hexagon wrench, it mainly corresponds to the size of bolt or nut. Its specifications range from 5.57 to 36 (unit: mm), and the common ones are M3, M4, m 5, M6, M8, M 10, M 12, M 14, M 16 and M/kloc-.